70f1ad4aeb
The RAK13302 1W module uses a Skyworks SKY66122-11 front-end module with three digital control pins (CSD, CTX, CPS) that must be actively driven by the host MCU. The previous code only managed CTX (GPIO 31) — toggling it for TX/RX — but never initialized CSD (GPIO 24) or CPS (GPIO 21), leaving them floating with no pull-up/pull-down resistors on the PCB. With floating CSD and CPS, the SKY66122 was in an undefined operating mode: - The 30 dB TX PA may not have been reliably engaging - The 16 dB RX LNA was never reliably active, degrading receive sensitivity
52 lines
1.2 KiB
C++
52 lines
1.2 KiB
C++
#pragma once
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#include <MeshCore.h>
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#include <Arduino.h>
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#include <helpers/NRF52Board.h>
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// built-ins
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#define PIN_VBAT_READ 5
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#define ADC_MULTIPLIER (3 * 1.73 * 1.187 * 1000)
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#define PIN_3V3_EN (34)
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#define WB_IO2 PIN_3V3_EN
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class RAK3401Board : public NRF52BoardDCDC {
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protected:
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#ifdef NRF52_POWER_MANAGEMENT
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void initiateShutdown(uint8_t reason) override;
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#endif
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public:
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RAK3401Board() : NRF52Board("RAK3401_OTA") {}
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void begin();
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#define BATTERY_SAMPLES 8
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uint16_t getBattMilliVolts() override {
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analogReadResolution(12);
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uint32_t raw = 0;
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for (int i = 0; i < BATTERY_SAMPLES; i++) {
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raw += analogRead(PIN_VBAT_READ);
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}
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raw = raw / BATTERY_SAMPLES;
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return (ADC_MULTIPLIER * raw) / 4096;
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}
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const char* getManufacturerName() const override {
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return "RAK 3401";
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}
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// SKY66122 FEM TX/RX switching via CTX pin.
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// CTX=HIGH: TX mode + 5V boost ON (PA powered from VCC1/VCC2)
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// CTX=LOW: RX mode + 5V boost OFF (LNA powered from VSUP1 at 3.3V)
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void onBeforeTransmit() override {
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digitalWrite(P_LORA_PA_EN, HIGH); // CTX=1: TX mode, boost on
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}
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void onAfterTransmit() override {
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digitalWrite(P_LORA_PA_EN, LOW); // CTX=0: RX mode, boost off
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}
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};
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